Sec·vor 10 Jahren·discussI know that you have to register your phone specially to use it in russia, but I have no idea if that actually affects reachability.I know Iridium is illegal in Kuba, but works just fine there.I don't recall any restriction in china, currently.
Sec·vor 10 Jahren·discussIf you have an SDR at hand and want to try it yourself, get the code from GitHub https://github.com/muccc/iridium-toolkit Even with a simple WLan antenna you will get some reception outside (preferrably on a roof).
I know Iridium is illegal in Kuba, but works just fine there.
I don't recall any restriction in china, currently.